Incandescent-electric-lamp base.



, PATENTED NOV. 24, 1903. J. E. CASEY. IINGANDESGENT ELECTRIC LAMP BASE.

APPLICATION FILED JULY 20, 1903.

N0 MODEL,

TUFNEYE:

Nrrnn' Sterne Patented November 24, 1903.

nrnwr rrrcn.

JOSEPH E. CASEY, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO PROVI- DENCE GAS BURNER COMPANY, OF PROVIDENCE, RIIODE ISLAND.

SPECIFICATION forming part of Letters Patent No. 744,957, dated November 24, 1903.

Application filed July 20,1903.

Mi whom it may concern.-

Be it known that I, JOSEPH E. CASEY, a citizen of the United States, residing at Providence, in the county of Providence and State .5 of Rhode Island, have invented'a new and useful Improvement in Incandescent-Electric-Lamp Bases, of which the following is a V specification.

This invention has reference to an improvement in incandescentelectric-lamp bases, and more particularly to an improvement in the contact-plate of the base connecting the lamp with the lamp-socket.

In incandescent-lamp bases as heretofore constructed the contact-plate on the porcelain insulating-cap forming the end of the base was secured to the cap by a tubular rivet forming a part of the contact-plate. This rivet extends centrally from the contact-plate through a central hole in the cap and is upset on the end, securing the contact-plate to the cap. One of the connecting-wires from the lamp passes through the tubular rivet of the contact-plate and is soldered to the contact-plate. The other Wire passes through a hole in the ins'ulatingcap and is soldered to the shell of the base. In this construction the frictional resistance on the contact-plate in screwing the lamp into its socket is liable to turn the contact-plate on the cap and break the Wire connection to the lamp.

The object of my invention is to prevent the turning of the contact-plate on the insulating-cap forming the end of the base of an incandescent lamp and the breaking of the connecting-wire from the lamp to the contact-plate.

My invention consists in the peculiar and novel construction of the base of an incandescent electric lamp, whereby the contactplate on the end of the base is prevented from turning and breaking the connectingwire from the lamp to the contact-plate, as will be more fully set forth hereinafter.

Figure 1 is a side view of my improved in candescent-electric-lamp base, showing the lamp in broken lines. Fig. 2 is an enlarged end View of the base, showing the means for preventing the contact-plate from turning, consisting of a rib on the contact-plate extending into a groove in the insulating-cap Serial No. 166,391. (No model.)

forming the end of the base. Fig. 3 is an enlarged sectional view of the base, taken on line X X of Fig. 1, showing the rib on the contact-plate in the groove in the insulatingcap and the central tubular rivet securing the contact-plate to the insulating-cap. Fig. 4 is an end view of the insulating-cap, showing the groove for the rib on the contactplate. Fig. 5 is a view looking at the under side of the contact-plate, showing the rib and tubular rivet; and Fig. 6 is an edge View of the contact-plate, showing the stamped rib on the plate and the tubular rivet formed in one piece with the plate.

In the drawings, a indicates the usual shell of an incandescent-electric-lamp base, 5 the porcelain insulating-cap, and c the contactplate. The shell (2 has the usual screw-thread a and the contracted end 0L2 for securing the insulating-cap b to the shell by spinning the end over the edge of the insulating-cap. The insulating-cap b has the central hole I), the V-shaped groove b, crossing the central hole, the hole 19 for the wire connection from the lamp, and the indentures b b in the under edge of the cap to prevent the cap from turning in the contracted end a by forcing the metal of the contracted end into the indentures b b in the cap. The contact-plate c has the tubular rivet 0, formed from the plate and the stamped rib 0 on the under side of the plate. The contact-plate c is secured on the insulating-cap b by the tubular rivet c in the hole I) and is prevented from turning on the insulating-cap by the rib c on the plate coinciding with the groove 19 in the insulating-cap.

One of the connecting-wires from the lamp is carried through the tubular rivet o and soldered in the groove formed by the stamped rib c? on the contact-plate and the other carried through the hole b in the insulating-cap b and soldered to the shell or of the base.

By the use of my improved base for incandescent electric lamps the contact-plate is prevented from turning and breaking the connecting-wire from the lamp, and a more perfect and durable incandescent-electriclamp base is constructed than has heretofore been done.

It is evident that points bent downward from the edge of the contact-plate to enter plate from turning on the cap, Consisting of r the groove or indentures in the insulatinga rib on the plate coinciding with a groove cap could be used without materially afiectin the insulating-cap, for the purpose as de- 15 ing the spirit of my invention. scribed.

Having thus described 'my invention, I In testimony whereof I have signed my claim as new and desire-to secure by Letters name to this specification in the presence of Patent two subscribing witnesses.

In a base for incandescent lamps, a screwa threaded cylindrical shell, an insulating-cap JOSEPH CASEY secured in one end of the shell, means for securing the contact-plate to the insulatingcap, and means for preventing the contact- Witnesses:

ADA E. HAGERTY, J. A. MILLER, Jr. 

